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A 3–7GHz 4-element digital modulated polar phased-array transmitter (TX) in 40nm CMOS with 0.35° phase resolution and 38.2% peak system efficiency is presented in this paper. Phase-shifting in phase modulation path is utilized in each element to improve amplitude error. The RMS phase error of 0.3° is achieved with current-DAC based 10-bit phase shifter after digital pre-distortion. Efficiency for...
A 3.1–7 GHz fully integrated polar transmitter (TX) in 40-nm CMOS process with high data-rate and reconfigurable feed-forward operation is proposed. The real-time feed-forward operation is utilized to improve the power efficiency at back-off and saturated power levels in a wideband. With the wideband Marchand balun based open-loop digital phase modulator, the wide modulation-bandwidth and high data-rate...
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